Correlation of Tensile Strength between Mechanical and Chemical Anchors with Concrete’s Compressive Strength

This study evaluated the preliminary relationship between anchor tensile strength and concrete compressive strength through semi-destructive pull-out tests. Anchors were tested in concrete with compressive strengths of 18, 24, and 32 MPa, using mechanical (drop-in and wedge) and chemical anchors sized 8 and 10 mm, embedded at 40 mm depth. Results indicated that higher concrete compressive strength correlates with increased anchor tensile strength. On average, a 30–60% rise in concrete strength led to a 15–70% increase in anchor tensile strength, varying with anchor type and size. Chemical anchors demonstrated the highest tensile strength, followed by drop-in and wedge anchors, respectively. Additionally, 8 mm anchors generally exhibited higher tensile strength than 10 mm anchors. Two primary failure modes were observed: concrete failure and threaded rod failure. Concrete failure predominated in the tests. Despite yielding valuable insights, the study has limitations such as fixed drilling depth and limited anchor and concrete strength variations. Nevertheless, these findings lay a foundation for further research and development aimed at optimizing anchor performance in construction